Wccpv2 Configuration - Cisco ASR 1000 Series Configuration Manual

WCCPv2—IPv6 Support

WCCPv2 Configuration

Multiple routers can use WCCPv2 to service a content engine cluster. In WCCPv1, only one router could
redirect content requests to a cluster. The figure below illustrates a sample configuration using multiple routers.
Figure 6: Cisco Content Engine Network Configuration Using WCCPv2
The subset of content engines within a cluster and routers connected to the cluster that are running the same
service is known as a service group. Available services include TCP and UDP redirection.
In WCCPv1, the content engines were configured with the address of the single router. WCCPv2 requires
that each content engine be aware of all the routers in the service group. To specify the addresses of all the
routers in a service group, you must choose one of the following methods:
• Unicast—A list of router addresses for each of the routers in the group is configured on each content
• Multicast—A single multicast address is configured on each content engine. In the multicast address
The multicast option is easier to configure because you need only specify a single address on each content
engine. This option also allows you to add and remove routers from a service group dynamically, without
needing to reconfigure the content engines with a different list of addresses each time.
The following sequence of events details how WCCPv2 configuration works:
1 Each content engine is configured with a list of routers.
engine. In this case the address of each router in the group must be explicitly specified for each content
engine during configuration.
method, the content engine sends a single-address notification that provides coverage for all routers in
the service group. For example, a content engine could indicate that packets should be sent to a multicast
address of 224.0.0.100, which would send a multicast packet to all routers in the service group configured
for group listening using WCCP (see the ip wccp group-listen or the ipv6 wccp group-listen interface
configuration command for details).
IP Application Services Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)
WCCPv2 Configuration
93